Knee brace for chronic instability



FIG. 1 is a front elevation of the knee brace, showing the new design;

FIG. 2 is a left side elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a right side elevation thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a knee brace for chronic instability, as shown. 